refactor(xai): move native stt routing opt-out behind the provider config

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

litellm/constants.py

@@ -999,11 +999,7 @@ openai_compatible_providers: Final[list] = [
     "scx-ai",
 ]
 
-OPENAI_COMPATIBLE_PROVIDERS_WITH_NATIVE_AUDIO_TRANSCRIPTION: Final = frozenset({"xai"})
-
-OPENAI_AUDIO_TRANSCRIPTION_PROVIDERS: Final = frozenset(
-    {"openai"} | (frozenset(openai_compatible_providers) - OPENAI_COMPATIBLE_PROVIDERS_WITH_NATIVE_AUDIO_TRANSCRIPTION)
-)
+OPENAI_AUDIO_TRANSCRIPTION_PROVIDERS: Final = frozenset({"openai"} | frozenset(openai_compatible_providers))
 
 openai_text_completion_compatible_providers: Final[list] = [  # providers that support `/v1/completions`
     "together_ai",

litellm/llms/base_llm/audio_transcription/transformation.py

@@ -52,6 +52,15 @@ class BaseAudioTranscriptionConfig(BaseConfig, ABC):
         """
         return False
 
+    @property
+    def has_native_transcription_endpoint(self) -> bool:
+        """
+        Opt-in for OpenAI-compatible providers whose transcription lives on a
+        non-OpenAI route: when True the request skips the OpenAI SDK transport
+        and goes through this config via the shared http handler.
+        """
+        return False
+
     def get_complete_url(
         self,
         api_base: str | None,

litellm/llms/xai/audio_transcription/transformation.py

@@ -63,6 +63,10 @@ class XAIAudioTranscriptionConfig(BaseAudioTranscriptionConfig):
     def custom_llm_provider(self) -> str:
         return litellm.LlmProviders.XAI.value
 
+    @property
+    def has_native_transcription_endpoint(self) -> bool:
+        return True
+
     def get_supported_openai_params(
         self, model: str
     ) -> list[OpenAIAudioTranscriptionOptionalParams]:  # mutable-ok: base class signature returns list

litellm/main.py

@@ -7831,6 +7831,10 @@ def transcription(
         provider=LlmProviders(custom_llm_provider),
     )
 
+    uses_openai_transport: Final = custom_llm_provider in OPENAI_AUDIO_TRANSCRIPTION_PROVIDERS and not (
+        provider_config is not None and provider_config.has_native_transcription_endpoint
+    )
+
     if custom_llm_provider in AZURE_OPENAI_AUDIO_PROVIDERS and provider_config is None:
         # azure configs
         api_base = api_base or litellm.api_base or get_secret_str("AZURE_API_BASE")
@@ -7860,7 +7864,7 @@ def transcription(
             litellm_params=litellm_params_dict,
             custom_llm_provider=custom_llm_provider,
         )
-    elif custom_llm_provider in OPENAI_AUDIO_TRANSCRIPTION_PROVIDERS:
+    elif uses_openai_transport:
         api_base = (
             api_base
             or litellm.api_base